StartCom CA is closed since Jan. 1st, 2018, it doesn't issue any new certificate from StartCom name roots.
If you want to buy trusted SSL certificate and code signing certificate, please visit https://store.wotrus.com.
If you want to apply free email certificate, please visit https://www.mesign.com to download MeSign APP to get free email certificate automatically and send encrypted email automatically.
Best Regards,